US7703110B2 - Structure for attaching printed circuit board on traverse chassis - Google Patents

Structure for attaching printed circuit board on traverse chassis Download PDF

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Publication number
US7703110B2
US7703110B2 US11/507,111 US50711106A US7703110B2 US 7703110 B2 US7703110 B2 US 7703110B2 US 50711106 A US50711106 A US 50711106A US 7703110 B2 US7703110 B2 US 7703110B2
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US
United States
Prior art keywords
groove
printed circuit
circuit board
traverse chassis
edge portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
Application number
US11/507,111
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English (en)
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US20070044114A1 (en
Inventor
Takayuki Murakami
Ryuuji Hayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Funai Electric Co Ltd
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Funai Electric Co Ltd
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Filing date
Publication date
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Assigned to FUNAI ELECTRIC CO., LTD. reassignment FUNAI ELECTRIC CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAYASHI, RYUUJI, MURAKAMI, TAKAYUKI
Publication of US20070044114A1 publication Critical patent/US20070044114A1/en
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Publication of US7703110B2 publication Critical patent/US7703110B2/en
Expired - Fee Related legal-status Critical Current
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/22—Apparatus or processes for the manufacture of optical heads, e.g. assembly
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/12—Disposition of constructional parts in the apparatus, e.g. of power supply, of modules

Definitions

  • the present invention relates to an optical disk apparatus for reproducing and recording information with respect to an optical disk such as a CD or a DVD which is an information recording medium, and more particularly to a structure in which a printed circuit board, which is a component element of an encoder for controlling the driving of a motor for driving each of a pickup unit, a traverse chassis, and a disk tray, is attached in an upright state on the traverse chassis.
  • an optical disk apparatus is an apparatus in which a clamped optical disk is rotated, and laser light is applied to a recording surface of the optical disk to write (record) information on the recording surface, and the laser light reflected from the recording surface of the optical disk is received to read (reproduce) the information on the recording surface.
  • the outer configuration of the optical disk apparatus is mainly comprised of a fixed main chassis and a movable traverse chassis (e.g., refer to JP-A-2004-253130, JP-A-2003-297065 and JP-A-11-224482).
  • a disk tray is supported in the main chassis in such a manner as to be drawably inserted into the main chassis from the front side.
  • a main chassis 1 is a molded product of a synthetic resin such as polystyrene (PS), and a traverse chassis 2 is a molded product of a synthetic resin such as polyphenylene ether (PPE).
  • PS polystyrene
  • PPE polyphenylene ether
  • a pickup unit 3 which reciprocatingly moves in the radial direction (in the back-and-forth direction in FIG. 5 ) parallel to the recording surface of the optical disk is provided on the traverse chassis 2 .
  • the driving force of the motor 4 is transmitted to the pickup unit 3 , thereby moving the pickup unit 3 .
  • the guiding of the movement of the pickup unit 3 is generally effected by a pair of guide shafts supported on the traverse chassis 2 in parallel to its moving direction.
  • the frontmost spur gear of the gear train 5 meshes with a tray gear 8 provided on the traverse chassis 2 .
  • This tray gear 8 is capable of meshing with a rack of a cam slider 6 disposed on the main chassis 1 side in front of the traverse chassis 2 .
  • the cam slider 6 is in cam engagement with a shift lever 7 provided on a front end portion of the traverse chassis 2 , and is movable in the transporting direction (back-and-forth direction) of the disk tray and in a direction (left-and-right direction) substantially perpendicular to the raising/lowering direction of the traverse chassis 2 .
  • the driving force of the motor 4 is transmitted to the cam slider 6 , so that the cam slider 6 moves in the left-and-right direction. While the shift lever 7 which is in cam engagement is thereby guided, the traverse chassis 2 is raised and lowered.
  • the tray gear 8 is capable of meshing with a rack formed on the disk tray in such a manner as to extend in the back-and-forth direction. As the rack of the disk tray meshes with the tray gear 8 , the driving force of the motor 4 is transmitted to the disk tray, so that the disk tray is moved in the back-and-forth direction.
  • the optical disk is loaded on the disk tray drawn out of the main chassis 1 , and as the motor 4 is driven, the disk tray is sent into the main chassis 1 .
  • the disk tray is sent up to a predetermined position, the rack of the disk tray and the tray gear 8 are disengaged, and the rack of the cam slider 6 and the tray gear 8 are engaged with each other.
  • the cam slider 6 moves in the left-and-right direction to raise the traverse chassis 2 .
  • the traverse chassis 2 is raised to a predetermined position, the rack of the cam slider 6 and the tray gear 8 are disengaged, and the optical disk is clamped.
  • a clamper holder is installed on the upper side of the main chassis 1 in such a manner as to extend in the left-and-right direction, and a substantially disk-shaped clamper is rotatably provided on its center.
  • a spindle motor is installed on the traverse chassis 2 opposing the clamper, and a turntable 9 which rotates as the spindle rotates (the spindle motor is driven) is fixed to a distal end of the spindle of this spindle motor. Then, as the traverse chassis 2 is raised, a central hole of the optical disk is fitted to the turntable 9 , and the optical disk is clamped between the upper surface of the turntable 9 and the lower surface of the clamper.
  • the driving of the pickup unit 3 , the driving of the traverse chassis 2 , and the driving of the disk tray are effected by the driving force of the motor 4 , and an encoder E is used to properly control the driving of the motor 4 when each of these members is driven.
  • This encoder E is configured by a disk-shaped slit plate S fixed to the distal end of the spindle of the motor 4 as well as a photo interrupter (PI) P disposed in such a manner as to sandwich an outer peripheral portion of this slit plate S from above and below. A multiplicity of radial slits are formed in the slit plate S.
  • the photo interrupter P is mounted on an exclusive-use printed circuit board (hereafter referred to as the “PI board” in some cases) 10 by soldering, and this PI board 10 is attached in an upright state on the traverse chassis 2 .
  • This attachment is performed by first screwing down the PI board 10 to an exclusive-use board holder, i.e., a separate part, by a screw, and by screwing down the board holder to the traverse chassis 2 by a tapping screw.
  • This PI board 10 is connected to a control unit for controlling the operation of the overall optical disk apparatus.
  • the slit plate S rotates as the motor 4 is driven, i.e., as its spindle rotates.
  • the slits which passed through the photo interrupter P are consecutively detected, and a pulse signal corresponding thereto is outputted from the PI board 10 .
  • the control unit upon receiving the pulse signal, counts the number of pulses, and imparts to the motor 4 a drive signal (e.g., a signal concerning a voltage value to the motor 4 ) which is appropriate for driving each of the pickup unit 3 , the traverse chassis 2 , and the disk tray.
  • a drive signal e.g., a signal concerning a voltage value to the motor 4
  • the point of time when an on/off output of this inner peripheral end detecting switch is provided is used as a reference point when the pulse signal from the PI board 10 is counted.
  • the PI board 10 since the PI board 10 must be attached in an upright state on the traverse chassis 2 , if the board holder is eliminated, for example, a plate-like rib is formed in advance on the traverse chassis 2 , and the PI board 10 is superposed in an upright state on this rib and is screwed down while a hole is being tapped with a tapping screw. In this case, since it is necessary to form in the rib a prepared hole for receiving the tapping screw, as a mold for molding the traverse chassis 2 , a pin-shaped mold for separately molding that prepared hole becomes additionally necessary.
  • the present invention has been made in view of the above-described problems, and its object is to provide an inexpensive attachment structure which makes it possible to attach the PI board in an upright state on the traverse chassis.
  • a structure for attaching a printed circuit board on a traverse chassis in an optical disk apparatus comprising: a main chassis; a disk tray for transporting an optical disk to the main chassis; a traverse chassis which is raised and lowered with respect to a recording surface of the optical disk transported into the main chassis; a pickup unit having an optical pickup which reciprocatingly moves in a radial direction parallel to the recording surface of the optical disk while being supported by the traverse chassis; a motor provided in the traverse chassis to drive the disk tray, the traverse chassis, and the pickup unit; and an encoder including a slit plate which is fixed to a spindle of the motor and rotates as the motor is driven and a printed circuit board on which a photo interrupter is mounted sandwiching the slit plate from above and below and which is attached in an upright state on the traverse chassis, the printed circuit board being attached without a board holder screwed down with a screw to the traverse chassis, wherein a first groove,
  • the traverse chassis can be obtained inexpensively without entailing an increase in the manufacturing cost.
  • a structure for attaching a printed circuit board on a traverse chassis in an optical disk apparatus comprising: a main chassis; a disk tray for transporting an optical disk to the main chassis; a traverse chassis which is raised and lowered with respect to a recording surface of the optical disk transported into the main chassis; a pickup unit having an optical pickup which reciprocatingly moves in a radial direction parallel to the recording surface of the optical disk while being supported by the traverse chassis; a motor provided in the traverse chassis to drive the disk tray, the traverse chassis, and the pickup unit; and an encoder including a slit plate which is fixed to a spindle of the motor and rotates as the motor is driven and a printed circuit board on which a photo interrupter is mounted sandwiching the slit plate from above and below and which is attached in an upright state on the traverse chassis, wherein a first groove, a second groove, and a prepared hole are formed in the traverse chassis, the first groove is
  • the traverse chassis can be obtained inexpensively without entailing an increase in the manufacturing cost.
  • an upper side of the edge portion on the other side of the printed circuit board should be notched, and an inner surface of a head of a tapping screw screwed into the prepared hole should be brought into pressure contact with a lower end of the notch.
  • the board holder and the screw for fixing it and the printed circuit board which are conventionally required, become completely unnecessary, so that this leads to a reduction in the number of parts by that portion.
  • the traverse chassis can be obtained inexpensively. As a result, it is possible to sufficiently realize a cost reduction of the optical disk apparatus.
  • FIG. 1 is an exploded perspective view illustrating a structure for attaching a printed circuit board on a traverse chassis in an optical disk apparatus in accordance with an embodiment of the invention
  • FIG. 2 is a perspective view illustrating a state of the attaching process in the installation structure shown in FIG. 1 , and is a diagram illustrating a state in which the printed circuit board is being installed;
  • FIG. 3 is a perspective view illustrating a state of the attaching process in the installation structure shown in FIG. 1 , and is a diagram illustrating a state persisting immediately before screwing down with a tapping screw;
  • FIG. 4 is a perspective view illustrating a state of the attaching process in the installation structure shown in FIG. 1 , and is a diagram illustrating a state of completion of installation;
  • FIG. 5 is a plan view illustrating the construction of a general optical disk apparatus which is common to the invention.
  • FIG. 1 is an exploded perspective view illustrating the structure for attaching a PI board on a traverse chassis in an optical disk apparatus in accordance with the embodiment of the invention.
  • FIGS. 2 to 4 are perspective views illustrating states of the attaching process in the installation structure shown in FIG. 1 , in which FIG. 2 shows a state in which the PI board is being installed, FIG. 3 shows a state persisting immediately before screwing down with a tapping screw, and FIG. 4 shows a state of completion of installation.
  • FIG. 2 shows a state in which the PI board is being installed
  • FIG. 3 shows a state persisting immediately before screwing down with a tapping screw
  • FIG. 4 shows a state of completion of installation.
  • a substantially L-shaped projection 20 is formed on a traverse chassis 2 in such a manner as to extend in the left-and-right direction and project upwardly from its end.
  • a first groove 21 whose width is substantially the same as (to be precise, slightly larger than) the thickness of the PI board 10 is formed along the left-and-right direction.
  • This first groove 21 functions to receive a lower edge portion of the PI board 10 in an upright state, nip the edge portion from the front and rear sides so as to be slidable in the left-and-right direction, and restrict the downward movement of the PI board 10 including its back-and-forth movement.
  • a second groove 22 whose width is substantially the same as (to be precise, somewhat larger than) the thickness of the PI board 10 is formed vertically on an extension of the first groove 21 .
  • This second groove 22 functions to nip that edge portion from front and rear sides, press down an upper end face of the PI board 10 , and restrict the sliding movement in the leftward direction and upward movement of the PI board 10 including its back-and-forth movement.
  • a prepared hole 23 for receiving a tapping screw 30 which will be described later is formed in the first groove 21 in such a manner as to vertically penetrate the traverse chassis 2 .
  • This prepared hole 23 is formed at a position adjacent to a right edge portion of the PI board 10 whose left edge portion is fitted in the second groove 22 while its lower edge portion is being nipped in the first groove 21 .
  • the formation of the projection 20 as well as the first groove 21 , the second groove 22 , and the prepared hole 23 is effected simultaneously with the molding of the traverse chassis 2 .
  • the formation of the first groove 21 suffices if a projecting portion is fabricated on the shape of a carved portion of an upper mold of the upper and lower molds used for molding.
  • the formation of the second groove 22 suffices if a projecting portion is fabricated on the shape of a carved portion of the lower mold which makes a pair with the upper mold.
  • a through hole 24 formed on the extension of the second groove 22 is formed to introduce the fabricated projecting portion into the lower mold (see FIG. 1 ).
  • the formation of the prepared hole 23 suffices if a pin-shaped projecting portion is fabricated on the shape of the carved portion of the upper or lower mold. Accordingly, since such a traverse chassis 2 can be obtained without making the molding process complex and can be obtained inexpensively without entailing an increase in the manufacturing cost.
  • an upper side of the right edge portion of the PI board 10 is notched, and a notch 11 is thus formed.
  • the installation of the PI board 10 on the traverse chassis 2 thus constructed is carried out as follows. As shown in FIG. 2 , in a state in which the PI board 10 is made upright, its lower edge portion is inserted into the first groove 21 , and the PI board 10 is slid toward the second groove 22 . Next, as shown in FIG. 3 , the left edge portion of the PI board 10 in that state is fitted into the second groove 22 . Then, while the tapping screw 30 is kept along the right end face of the PI board 10 , the tip of the tapping screw 30 is applied to the prepared hole 23 and is screwed into it. If the tapping screw 30 is screwed in as it is, as shown in FIG. 4 , the inner surface of the head of the tapping screw 30 is brought into pressure contact with the lower end of the notch 11 of the PI board 10 , thereby completing the installation of the PI board 10 on the traverse chassis 2 .
  • the PI board 10 is firmly installed in an upright state on the traverse chassis 2 .
  • the board holder and the screw for fixing it and the PI board 10 which are conventionally required, become completely unnecessary, so that this leads to a reduction in the number of parts by that portion.
  • the traverse chassis 2 can be obtained inexpensively without entailing an increase in the manufacturing cost. As a result, it is possible to sufficiently realize a cost reduction of the optical disk apparatus.
  • a long tapping screw 30 may be prepared, and the inner surface of its head may be directly brought into pressure contact with the upper end face of the PI board 10 .
  • a fixing member such as a hook, an adhesive agent may be employed.
  • the present invention is useful for an optical disk apparatus for reproducing and recording information with respect to an optical disk.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
US11/507,111 2005-08-22 2006-08-21 Structure for attaching printed circuit board on traverse chassis Expired - Fee Related US7703110B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005-239588 2005-08-22
JP2005239588A JP2007058914A (ja) 2005-08-22 2005-08-22 トラバースシャーシへのプリント回路基板の取付け構造

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US20070044114A1 US20070044114A1 (en) 2007-02-22
US7703110B2 true US7703110B2 (en) 2010-04-20

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US11/507,111 Expired - Fee Related US7703110B2 (en) 2005-08-22 2006-08-21 Structure for attaching printed circuit board on traverse chassis

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080209455A1 (en) * 2007-02-28 2008-08-28 Yu-Feng Chien Disc drive with a small-sized circuit board
US20110239239A1 (en) * 2010-03-29 2011-09-29 Lg Innotek Co., Ltd. Integrated Disk Driving Module
US20120327170A1 (en) * 2011-06-24 2012-12-27 Hon Hai Precision Industry Co., Ltd. Optical recording apparatus with limiting members

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2102864A1 (en) * 2006-12-14 2009-09-23 Koninklijke Philips Electronics N.V. Disk drive and tray control mechanism

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09311057A (ja) * 1996-05-24 1997-12-02 Matsushita Electric Ind Co Ltd ロータリーエンコーダ
US5727761A (en) * 1995-09-29 1998-03-17 Ho; Hsin Chien Circuit board locating device
US5821531A (en) * 1996-01-26 1998-10-13 Asahi Kogaku Kogyo Kabushiki Kaisha Dual sensor encoder for detecting forward/reverse rotation having light modulating patterns with a predetermined phase different
JPH118481A (ja) * 1997-06-18 1999-01-12 Funai Electric Co Ltd 回路基板上の部品の保護構造
JPH11224482A (ja) 1998-02-04 1999-08-17 Matsushita Electric Ind Co Ltd 記録再生装置
JP2003297065A (ja) 2002-04-02 2003-10-17 Matsushita Electric Ind Co Ltd ディスク装置
JP2004253130A (ja) 2004-04-09 2004-09-09 Mitsubishi Electric Corp 光ディスク装置
US20040235322A1 (en) * 2001-08-10 2004-11-25 Axxion Group Corporation Screwless circuit board attachment

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5727761A (en) * 1995-09-29 1998-03-17 Ho; Hsin Chien Circuit board locating device
US5821531A (en) * 1996-01-26 1998-10-13 Asahi Kogaku Kogyo Kabushiki Kaisha Dual sensor encoder for detecting forward/reverse rotation having light modulating patterns with a predetermined phase different
JPH09311057A (ja) * 1996-05-24 1997-12-02 Matsushita Electric Ind Co Ltd ロータリーエンコーダ
JPH118481A (ja) * 1997-06-18 1999-01-12 Funai Electric Co Ltd 回路基板上の部品の保護構造
JPH11224482A (ja) 1998-02-04 1999-08-17 Matsushita Electric Ind Co Ltd 記録再生装置
US20040235322A1 (en) * 2001-08-10 2004-11-25 Axxion Group Corporation Screwless circuit board attachment
JP2003297065A (ja) 2002-04-02 2003-10-17 Matsushita Electric Ind Co Ltd ディスク装置
JP2004253130A (ja) 2004-04-09 2004-09-09 Mitsubishi Electric Corp 光ディスク装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, Publication No. 11-224482, Publication Date Aug. 17, 1999 (2 pages).
Patent Abstracts of Japan, Publication No. 2003-297065, Publication Date Oct. 17, 2003 (2 pages).
Patent Abstracts of Japan, Publication No. 2004-253130, Publication Date Sep. 9, 2004 (2 pages).

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080209455A1 (en) * 2007-02-28 2008-08-28 Yu-Feng Chien Disc drive with a small-sized circuit board
US8082560B2 (en) * 2007-02-28 2011-12-20 Lite-On It Corp Disc drive with a small-sized circuit board
US20110239239A1 (en) * 2010-03-29 2011-09-29 Lg Innotek Co., Ltd. Integrated Disk Driving Module
US8458735B2 (en) * 2010-03-29 2013-06-04 Lg Innotek Co., Ltd. Integrated disk driving module
US20120327170A1 (en) * 2011-06-24 2012-12-27 Hon Hai Precision Industry Co., Ltd. Optical recording apparatus with limiting members
US8635636B2 (en) * 2011-06-24 2014-01-21 Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd Optical recording apparatus with limiting members for the flexible cable

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US20070044114A1 (en) 2007-02-22
JP2007058914A (ja) 2007-03-08

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